Interval signalling timer



FIG. 1 is a top right front perspective view of an interval signallingtimer showing my new design;

FIG. 2 is a right side elevational view thereof, the left side being amirror image thereto;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof.

The ornamental design for an interval signalling timer, as shown anddescribed.